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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee742cb3c4112bae08d51558cdc79d55800d515227601442a834d60daf560d2' 
  AND token = 'diOwy9lybvh3kMAwmu0GmabPGiwzNDmXLj21dfBhMb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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