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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78138ad840b37f80566270567e7a5a20cbe35dc871227a410cd6ca6aa007ad20' 
  AND token = 'MY1AlJbpGHrc4rzUpxFzzTSZUcz500sXXZee/r9K+/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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