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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68445c77a4d26548c6985e23c5165fbda4c984d79d7d54df855a5978af373297' 
  AND token = '6stO0dFzFYa5gN0JuBXQ4OA+oSH9zoBB0q/CY/qRq4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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