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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20872cc1dbc3f91f7c1a20896aa930d5dd0b7317aa8d1eb22a7946056c6142d0' 
  AND token = '4/9aXghrEOd4TnuRe9zOwu9eGZa2T7WpGMSibjokVbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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