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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cdda8a32f50145fdb67686d44c9e86bdfe5518dee7e3cf85834c651bc050e0' 
  AND token = 'gMe4t0rzcH75sQYVCpkSklVbTroOugA30q/3nfDqIlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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