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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c09e8cf0e6db5475257ebf5c90a5ab8bfe96082074cf4bd52ced5a7b998ca9' 
  AND token = 'jFMUhls2QXHMjiUgPm0wZHyyN1K+e1yrl2txJ6EK7eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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