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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bdf728d5e76a5f4037c56009b0990eccd5958bf254ddae9a6e5891557b9a795' 
  AND token = 'm7ajwGTBZERiZvZuMcglphSdy8o7fc/JpJrwqoihHdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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