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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60efbc7586af6f5f3f087f2a9de027bdbd69fe62483c33851914df7901a8a17' 
  AND token = 'mQ8/TkYWAxyU6e1VuNE836LsKtLP/3LAnlmAmnQWzW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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