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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470b21eba0efaa3746420b018f696d37bf5b3721b76dd5a1f6ec47df86bc253d' 
  AND token = '5AHwav0N6FeqRVnWrtl5a2ZWFKYyEmp9qbI0GsbpnhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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