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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db78ded71f0f104ef79c9c2ee5e4fbc1ac00f39fb7dd981fe026ae36571155b3' 
  AND token = 'ASo6UHG4ufs5HmxcmG28azVz3HKTn+6NaVj42w0P318=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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