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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3eca15215090a871da5ead24847b73098ca694293896e9321dfc8115f476cff' 
  AND token = 'Q2Iic+l5CMXsMT3OIGSaXddhRP6Swi7AW6/nfr/vVU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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