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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af0dbc53c6da9d162b7b264c42d0db4567d8a9ae46bd3d5efe11b4842cb805a' 
  AND token = 'ycyHWNSW0RVl6p8CTTMmjN0fbo55KC8t5zReTUgJYUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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