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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fea287d2c5d93f2e194879f10fb7c08d71be1e6fca09bceebea2869e8cc5db' 
  AND token = 'Wl7dw5CKaOPPkb1TMsICTNlA3B186kJm7UkXzcY9PEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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