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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98a81608d6d8a4c889fe8e8320ec8a744eee02f83a76c9bc4538db6ba153573' 
  AND token = 'NRqQRxaW7mB30g6urwjiR4+5R/e86gP5xkO2P+GAcNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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