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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee51fb34bb11964570c83f798833d597180ce194671d7d7c8649f95312c28e3' 
  AND token = 'rZ0NR6q8bZ9TADuFMD7DIB4B7qHhTAjHILGluWywt1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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