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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe1a82542d1d4cbc40a413e16ce57496ec145f9f0f955d9a95409554e4b9c0d' 
  AND token = 'dkntDPQashw74Quh2NLDHMGO/JK07zRU7i1MkjUhK9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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