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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d53c5cbcf22044d6e5ae341be4ab2a4b0477f8fd4ac16d92650dd17549fa73' 
  AND token = 'sjXZmRA9dhgOO/89g3osoRYBhmeYDON+sMs0U6KEmWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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