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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc89e2fa9136bb179e6e5d7dc648308b796dcec906017737180c9ddbc3bd9fb8' 
  AND token = '+jHlr8QLSpc3efIGUCAyHlCwWK0DjBKh+EyD98GXwsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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