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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae7e7e09b9e8ee3fbdff8153d0171c4a04e8a80c5da9ced262176666042eef9' 
  AND token = 'OnAFAKrxxdWSfFyR2cd3qbDnscSqWcAOqgDe29wrkb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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