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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8629507cc186b82da90bce32d86b6004d327def8c0c0bbb6dad5be669112c2b' 
  AND token = 'ElAJs+WRRerKP2f7gBtxtdtwDf7Xy9ZbHXkf/i3gy0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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