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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4565aa031c57cd846f61777bc04bc3852d49577484e6643f7aa1df564c43031d' 
  AND token = '43Oo3rJZPpZFUxTaXj/yelJD3q48B5231PelQKNTJoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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