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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc5298c27dd9965f9e55ead59a3af88d810ec4f4f2bf75ca65ecf4a19215261' 
  AND token = '3uSCtrM+m7ALRwooZai9C0fw9FcGq2B9axDYDBqrmzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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