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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338a54a5d25bf5c37e3ef6a9267ef58a5c91293c41637b8e668944162f2fe2cd' 
  AND token = 'NClmjCckBEZGfrmISGQLWO0f2jee+zZ9RF/nSYlRiBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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