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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a10f1da39d4efaffbb51e1ac5841db5c74c159f22ee97cfb464b1f4e985180' 
  AND token = 'sU28eTs59ZMzBKtj8H9P/Mepd1BchX0tBHDMFgj6A9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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