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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc02598992f5f6f5e5666dd8cf8a9d49c918851d96cb2e758185fc51c8a42f18' 
  AND token = 'GJjDFXfdVOQ5B/Ykbp7X2jVNhelaihHbmvYsdI10V60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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