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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7084222df62f7aaecef3cc5f861e615ddf667bd9cd3f19ae10956c3d4f13ccd' 
  AND token = 'V8ggl4SIZpxvFyOjAVKkP2jAfV64Mjj0h1QqsAA2v/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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