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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e5f298da4d831c11ddccf0eef0cfa2f4538d63e43c302cffefeb817c112956' 
  AND token = 'TOQxnNu2gbCLUKmJ0IhUHy3hA17gzBf38cCo3dciSyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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