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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98dc129bb4cbd1d18f7b9c4ad0226aee4129783313d6ef9c9cfab3d4ef3229a8' 
  AND token = 'PvINLc9s5UXcvkLo0xXwEtlcHsbO4Mj2r+x5U26JK/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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