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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c48c31e28fc02812db66a34d127529f3fe5cc26cabc0e045ea80f096587958c' 
  AND token = 'xmBHcH6GhFTxep2y3eCfz7b8HaeQSfJ2cHFj2c7Dgqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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