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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990fd441e30e51561cc705d045c198a816988c566765f3e82d9fdca72f00c8ad' 
  AND token = 'jgMytm+bu+xsdl1b5qRXumZyUOAtS2YUqrICcueSAKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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