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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f813d6704aee2af74cdaea3ae43e8f7273a24b5c0fe726c40c840225097383' 
  AND token = 'rW6ymHdyO5Nbgvjdh7bXLH4pQfniIDAnZMn0l/jkH7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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