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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1febfc5b0391af8cfc4d34523d5efe47a47cd547fd6045ae893c6ab22fd93612' 
  AND token = 'lvMN+jf4YN+qMEIDLtXudeQIkdI7boKw7xkyZP3cQ/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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