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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b00ce474f044f81aa4d4195f8b828c43edfe46f9d590f139539fed49d393d4' 
  AND token = 'CJP5H0aj5iiadvHasxE9KGaIzT7Lkiukb5qJ4vJj5SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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