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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30ce6cd771f72201c9b5ebb653a82f99d93671708e67cbfee9b283ce4c75608' 
  AND token = 'JFIDHZ2Y2JtlMpojw/5XABLDWIKlO/bmfaXNcjgLkck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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