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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f4a5ecb44a66a953824d75c41829ceb9b376b166c5e4dc44b2b43eb2571bac' 
  AND token = '6JhXQZPiVJ/JWh8q6X3tqr4LaRQjz5LaaElp4KshEH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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