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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8270c27753e36ffdeeafea00ae236207527e8b8c16b1b51b8c700a67e5b41c9b' 
  AND token = 'f47FhouWhqAJPd2OiswuDgsPk5q6MOmnO/q13EnWvRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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