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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bed31078866f9bb359c743b19e015e9f3c4423d54456c06553ff9deb7abc170' 
  AND token = 'snsgNQF9AWbr9rfme3ISGa8L3oQm0SIBmwbtyN4LDKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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