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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5709b1d40bd136c98143dabbf2a97fad44c5459b5e7b49d9b96cf749e93d85' 
  AND token = '+7B5W6ABbE+fRa/PC69QZze4NEaPQlbQcIx0hLB7eXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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