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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40beaed535ab98ca3101cbe3dc1f6ab5d8457f65ab12f4ee406ed993893b3a35' 
  AND token = 'EXUjwkRhfcQoMkyFzooS9u0TlIO8/IXomvfDoEE0b1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}