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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68fce02189f33571d6c5738d623002d12ed8f5611a40801f09f5c448d45f002b' 
  AND token = '5+EdGaP9TZrFkhXGpHNI4CS3eWiIHIrmJCg/btdMOo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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