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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbd7ef34031b29f5a56cca7c54e8033b0e74339f61f2bc0e848199deb98ef5b' 
  AND token = 'Fk9OfAuPiA083vp9AAPLN2cEJMZFDKWjTRGw/FumBpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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