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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b153c401443da5fb8e94b40940cc4232072f6b6dc1d1a2856545dad7d6c1aa' 
  AND token = 'wMNgAjuQJmhbbA/UCkSQMUXF5l3J08bs6b4L6nnGHEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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