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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7b001b0bf089c22ca4b816eb53b2c6ddbcc353814fc42d177dc534f5de8dac' 
  AND token = 'WE/+3PJ/CHepNoWuY1f0lFnEl0D+JDjNcW6Ge33Xueo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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