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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65cf6fdcc9f70deb194f87748a96683125cbef41ffe52a9b20676a71baca5d73' 
  AND token = 'ot23c3b5DEx7FzfMG54pDbr45Mvof6cw/CMGZy8qqRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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