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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5fcad5a0e1d01a48a20908b7ca25f0bab195b1c8ba582a16c5cb105a92501fa' 
  AND token = 'fff7az1EyDTGOBzcQ/uppSCX6eLF34uasY8CAjjTTRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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