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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d3360e2833f22829a6120a8cce152f0109f5da468a3f687fb263a1bbafdfae' 
  AND token = 'LsAU+vc9qgQJaQZH6hIL3l1VIaC9Ee8IZ0MqgXCAmCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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