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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0ed97f0f8ef020d57f61f8e5d4f93765535d223b2dc5752e8eb6d98c6a720f' 
  AND token = 'Q57EO1NJZWa0ZfgvuKyovmtKTdqaaKrWflENaGmlYS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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