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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4177bf5db7ed003c304f2846b84d5144bfeba5707243c753bca28faf9d9f0a' 
  AND token = 'fR/r3zkz7ev+neKd1JFGMkUOIdRwy66NsWYSQwq1qAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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