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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff730b431c4194421f356b0fc703be32299f239a4e920ae996447ec045e3b98e' 
  AND token = 'mLsqmHn7Rs++oNtLZ0LsSKcfnPTuYq5BvCJRvXLRzx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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