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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c90c7d76b1e181e1d554c71292741dc70164033b353fd77f3d85fceefe0966f' 
  AND token = '8SE6ruAeRJimlDUl0x5Tec01s3WyNYWaF+ppBEEihEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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