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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38279c256b5558ddb5d5bbb9ff32f67a1367cb1472b0f55544b0f946e10a7dd' 
  AND token = 'zSO7zm4bEA3G97HujqgQNSE0fXMoIpH3rR5AzZfoQwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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