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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d5d6612c6e1428d273e8e92b15ee99d7825ebdfafd0cc91021d03380897ea8' 
  AND token = '4GaWEeI6w+VVcDRsBEE4UJ+4wrukpJHcDcNvTzLZma4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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