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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a1de5e489f4fcf6d419a44f9278a2dd1dc5bc7106ad29efc243b11594407fa' 
  AND token = 'lTutGLanQpjjricd3Foxd5D3K2Qmqe2LmyG0quHHG8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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