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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd0b002a341f6e600eef2d5a84cc50120d51434abfb15ef5a916515c0e893cb' 
  AND token = 'ElwkgD1WH/a8W2DQlHwc2xtkr8colGfCJvg0wspi0kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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