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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511646c1915a6e6dcdc8dff7f8a6ec164f69e4be208545f5af50fd2ad455551b' 
  AND token = 'YvuJRgPAYGM932T6PBVVYst7gurDIx+7vI+1kDyXT3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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