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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c2b94c5050316a4376d692f2e54ca6a7826535fecf16b23acb4e0d183b549f' 
  AND token = '8hewusEU7SdE1xnUhI6L/cu+APkcFkEmT87j/rQqlVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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