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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af214940a56c948406c8b20178429f1dcf109f440be7e4da48e32b469946ff8f' 
  AND token = 'RahL7BQoi37iUY5SLHuwOxonBIvVe5HkEIcympT88Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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