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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fee5db9cd631fb127b63ac1d53b38fc52a92e024a16a08f33344b22da9d51e2' 
  AND token = 'C2qWPdyqPF6BwOf3xYOqs50U+QPauw2BtlbhmvW/gwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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