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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a56a0883a6cbbd04e0efef40f72574207dbd5c7d59a2226a8de703820e6099' 
  AND token = '08bwkc9oU7HlajX4rPIF4lD3DyoZWwdy9bOeXSmKmjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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