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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea05c2458adbe50d32580b74cdd362188eae691ca2838408db7896beaa955da6' 
  AND token = '4nZrRa66G0QUYNh2VgJNHJV4T4hf+8hzF+vQcfVUQX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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