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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7e6539e674e3ede44de0dabd4347b146466cdf33ebc494e85a58a5d7699c46' 
  AND token = '84+WXNQacRj/DRV0czp6rBQGE4x6gg1l1Qh2zelQfKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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