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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413a4a6ec1f511e45a05ab55cf1c8e4074423ee67e914361ef017907479e91da' 
  AND token = 'xwHsKKPFthVLKHPY7/upOmHRncwtBtQDwiUDdTJEGQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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