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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ade8ba3d52fbc9b66309bac9b9244e9f541a556a977b2a1d4c1e9814ce335d' 
  AND token = 'FhNNYxaKkg3EYEeQSts5C6ekPAewfb3gt1zNWGHEZvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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