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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f94ad8eea6a6f9c01c7bdc7c58ce2e105ae913c81f99562f8b41e8472b9578f' 
  AND token = 'CkGGNZmnMJHk1bhyaY+tzzw7tC3aArzDs0gTqgfLgco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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