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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fced1f56d7840aff56b8fb9212149d21d35c4b98670805d6758d4e16c978b0f' 
  AND token = 'KQy9IbJgRtpLLJ1Ju4K+iXXLXjLc38/JJ0uG0hLrN/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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