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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7696c2c3d85d9de88d41808b83a9c700aed58d93320a86cfc583379eb949bd85' 
  AND token = 'zV/GVjYxoqneoBC+TX8XzrdNUpcq95DI3vDvCCM0yTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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