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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90fc3c83db01785f86860b9487a4063b65d0b89e285bd9f81682708709809b43' 
  AND token = '2GMKq+n2tbvy0CiXkXvOx0rG60tdqN+sI3R/U4z2Hcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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