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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b15e03834751b8453f6b38511c5847a08d446a4b415866026c33e6f29f155d' 
  AND token = 'tby2Fv0u3IMSenerJTPx3QUnMXn7jL0B3UK74/H6mXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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